Photographing optical lens

Abstract

The present invention relates to the field of optical lenses. Disclosed is a photographing optical lens, comprising four lenses in total. The four lenses, from an object side to an image side, sequentially include: a first lens having negative refractive power, a second lens having positive refractive power, a third lens having positive refractive power, and a fourth lens having positive refractive power. The following conditional expressions are satisfied: -1.40≤f1 / f≤-1.15; 35.00≤FOV / Fno≤70.00; 2.00≤ET1 / d1≤2.90; 1.70≤f3 / f4≤3.20; and 0.60≤(R3+R4) / f2≤2.40. The photographing optical lens provided in the present invention has the effects of a large field of view, a large depth of field, and high-definition imaging.

Description

Camera optical lens [Technical Field]

[0001] This invention relates to the field of optical lenses, and in particular to a camera optical lens for use in medical imaging equipment. [Background Technology]

[0002] In recent years, with the rapid development of medical equipment, the demand for miniaturized camera optical lenses for endoscopy has been increasing. However, the molding quality of general camera optical lenses is poor and cannot meet the needs of medical imaging equipment.

[0003] In related technologies, camera optical lenses often employ three-element, four-element, or even five-element lens structures, with four-element structures being the most common. However, the biggest challenge today is how to rationally plan the focal length, thickness, and surface shape of a four-element lens structure of the same size to improve its field of view, depth of field, and image quality.

[0004] Therefore, there is an urgent need for a new type of camera optical lens to solve the above problems. [Summary of the Invention]

[0005] To address the aforementioned problems, the present invention aims to provide a new camera optical lens that meets the design requirements of a large field of view, a large depth of field, and high-definition imaging.

[0006] To solve the above-mentioned technical problems, the embodiments of the present invention provide a camera optical lens, which comprises four lenses in total. The four lenses are arranged in the following order from the object side to the image side: a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, and a fourth lens with positive refractive power.

[0007] Wherein, the focal length of the camera optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the field of view of the camera optical lens at 1.0 field of view is FOV, the aperture value of the camera optical lens is Fno, the edge thickness of the effective optical diameter of the first lens is ET1, the on-axis thickness of the first lens is d1, the central radius of curvature of the object side of the second lens is R3, the central radius of curvature of the image side of the second lens is R4, and the following conditions are satisfied:

[0008] -1.40≤f1 / f≤-1.15;

[0009] 35.00≤FOV / Fno≤66.00;

[0010] 2.00≤ET1 / d1≤2.90;

[0011] 1.70≤f3 / f4≤3.20;

[0012] 0.60≤(R3+R4) / f2≤2.40.

[0013] Preferably, the total optical length of the camera lens is TTL, and satisfies the following condition:

[0014] 5.50≤TTL / f≤7.00.

[0015] Preferably, at least one of the first lens, the second lens, the third lens, and the fourth lens is made of glass.

[0016] Preferably, the maximum absolute value of the distortion within 0.7 of the field of view of the camera optical lens is Dmax, and satisfies the following condition:

[0017] Dmax≤2.00%.

[0018] Preferably, the image-side surface of the first lens is concave at the paraxial position;

[0019] The total optical length of the camera lens is TTL, the central radius of curvature of the object side of the first lens is R1, the central radius of curvature of the image side of the first lens is R2, and the following conditions are satisfied:

[0020] 0.57≤(R1+R2) / (R1-R2)≤1.30;

[0021] 0.08≤d1 / TTL≤0.15.

[0022] Preferably, the object-side surface of the second lens is convex at the paraxial position, and the image-side surface of the second lens is concave at the paraxial position.

[0023] The total optical length of the camera lens is TTL, the on-axis thickness of the second lens is d3, and the following conditions are satisfied:

[0024] 2.09 ≤ f² / f ≤ 3.99;

[0025] -7.23≤(R3+R4) / (R3-R4)≤-1.89;

[0026] 0.14≤d3 / TTL≤0.30.

[0027] Preferably, the image-side surface of the third lens is convex at the paraxial position;

[0028] The total optical length of the camera lens is TTL, the central radius of curvature of the object side of the third lens is R5, the central radius of curvature of the image side of the third lens is R6, and the following conditions are satisfied:

[0029] 3.56≤f³ / f≤5.39;

[0030] -0.18≤(R5+R6) / (R5-R6)≤1.04;

[0031] 0.07≤d5 / TTL≤0.15.

[0032] Preferably, the object-side surface of the fourth lens is convex at the paraxial position, and the image-side surface of the fourth lens is convex at the paraxial position.

[0033] The total optical length of the camera lens is TTL, the central radius of curvature of the object side of the fourth lens is R7, the central radius of curvature of the image side of the fourth lens is R8, the axial thickness of the fourth lens is d7, and the following conditions are satisfied:

[0034] 1.62≤f4 / f≤2.02;

[0035] -0.16≤(R7+R8) / (R7-R8)≤0.71;

[0036] 0.10≤d7 / TTL≤0.23.

[0037] Preferably, the following conditions are met:

[0038] 2.19≤Fno≤3.37.

[0039] Compared with related technologies, the camera optical lens of the present invention, by defining the ratio of the focal length of the first lens to the focal length of the camera optical lens, the ratio of the field of view of the camera optical lens (1.0 field of view) to the aperture value of the camera optical lens, the ratio of the edge thickness of the effective optical diameter of the first lens to the on-axis thickness of the first lens, the ratio of the focal length of the third lens to the fourth focal length, and the surface shape of the second lens, can obtain a camera optical lens with a large field of view, a large depth of field, and high-definition imaging, and is particularly suitable for medical imaging equipment. [Attached Image Description]

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0041] Figure 1 is a schematic diagram of the structure of the camera optical lens in the first embodiment;

[0042] Figure 2 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 1;

[0043] Figure 3 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 1;

[0044] Figure 4 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 1;

[0045] Figure 5 is a schematic diagram of the structure of the camera optical lens in the second embodiment;

[0046] Figure 6 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 5;

[0047] Figure 7 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 5;

[0048] Figure 8 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 5;

[0049] Figure 9 is a schematic diagram of the structure of the camera optical lens in the third embodiment;

[0050] Figure 10 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 9;

[0051] Figure 11 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 9;

[0052] Figure 12 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 9;

[0053] Figure 13 is a schematic diagram of the structure of the camera optical lens in the fourth embodiment;

[0054] Figure 14 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 13;

[0055] Figure 15 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 13;

[0056] Figure 16 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 13;

[0057] Figure 17 is a schematic diagram of the structure of the camera optical lens in the fifth embodiment;

[0058] Figure 18 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 17;

[0059] Figure 19 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 17;

[0060] Figure 20 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 17;

[0061] Figure 21 is a schematic diagram of the structure of the camera optical lens according to the sixth embodiment;

[0062] Figure 22 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 21;

[0063] Figure 23 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 21;

[0064] Figure 24 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 21;

[0065] Figure 25 is a schematic diagram of the camera optical lens in the seventh embodiment;

[0066] Figure 26 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 25;

[0067] Figure 27 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 25;

[0068] Figure 28 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 25.

Detailed Implementation Methods

[0069] To make the objectives, technical solutions, and advantages of this invention clearer, the various embodiments of this invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this invention to facilitate a better understanding of the invention. However, the technical solutions claimed in this invention can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0070] Referring to the accompanying drawings, the present invention provides a camera optical lens 10, 20, 30, 40, 50, 60, 70. Figures 1, 5, 9, 13, 17, 21, and 25 show the camera optical lens 10, 20, 30, 40, 50, 60, 70 of the present invention. The camera optical lens 10, 20, 30, 40, 50, 60, 70 comprises four lenses in total. Specifically, from the object side to the image side, the camera optical lens 10, 20, 30, 40, 50, 60, 70 sequentially includes: a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, an aperture S1, a third lens L3 with positive refractive power, and a fourth lens L4 with positive refractive power. An optical element such as an optical filter GF may be disposed between the fourth lens L4 and the image plane S1.

[0071] The focal lengths of the imaging optical lenses 10, 20, 30, 40, 50, 60, and 70 are defined as f, and the focal length of the first lens L1 is defined as f1, satisfying the following condition: -1.40 ≤ f1 / f ≤ -1.15. This specifies the ratio of the focal length of the first lens L1 to the focal lengths of the imaging optical lenses 10, 20, 30, 40, 50, 60, and 70. In other words, by reasonably allocating the optical focal lengths of the imaging optical lenses 10, 20, 30, 40, 50, 60, and 70, they can achieve better imaging quality and lower sensitivity.

[0072] The field of view (FOV) of the 1.0 field of view of the camera optical lenses 10, 20, 30, 40, 50, 60, and 70 is defined as FOV, and the aperture value of the camera optical lenses 10, 20, 30, 40, 50, 60, and 70 is Fno, satisfying the following condition: 35.00≤FOV / Fno≤66.00.

[0073] The edge thickness of the effective optical diameter of the first lens L1 is defined as ET1, and the center thickness of the first lens L1 is defined as d1, satisfying the following condition: 2.00≤ET1 / d1≤2.90. This specifies the ratio of the edge thickness to the center thickness of the first lens L1, which is helpful for lens processing and lens assembly.

[0074] The focal length of the third lens L3 is defined as f3, and the focal length of the fourth lens L4 is defined as f4, satisfying the following condition: 1.70≤f3 / f4≤3.20. This specifies the ratio of the focal lengths of the third lens L3 and the fourth lens L4. By reasonably allocating the optical focal lengths of the camera lenses 10, 20, 30, 40, 50, 60, and 70, it helps to smooth the light transition and improve the image quality.

[0075] The focal length of the second lens L2 is defined as f2, the central radius of curvature of the object side of the second lens L2 is R3, and the central radius of curvature of the image side of the second lens L2 is R4, satisfying the following condition: 0.60≤(R3+R4) / f2≤2.40. This can reasonably control the surface shape of the second lens L2, which helps to reduce the sensitivity of the camera optical lenses 10, 20, 30, 40, 50, 60, and 70, and can also reduce stray light generated by the lens and improve the image quality of the lens.

[0076] Under the above conditions, camera optical lenses 10, 20, 30, 40, 50, 60, and 70 have good optical performance and can meet the design requirements of large field of view, large depth of field, and high-definition imaging. Based on the characteristics of these camera optical lenses 10, 20, 30, 40, 50, 60, and 70, they are particularly suitable for mobile phone camera lens assemblies, web camera lenses, and medical imaging equipment composed of high-pixel CCD, CMOS, and other imaging elements.

[0077] The total optical length of the camera optical lenses 10, 20, 30, 40, 50, 60, and 70 is defined as TTL, satisfying the following condition: 5.50≤TTL / f≤7.00. The telephoto ratio is specified. By being less than the upper limit of the condition, the total optical length can be controlled to be shorter, making it easier to achieve miniaturization. On the other hand, by being greater than the lower limit of the condition, it is easy to correct distortion and on-axis chromatic aberration, and good optical performance can be maintained.

[0078] The first lens L1 is made of plastic, the second lens L2 is made of plastic, the third lens L3 is made of plastic, and the fourth lens L4 is made of glass. This effectively distributes the material properties and corrects chromatic aberration, ensuring that the chromatic aberration |LC| ≤ 7.0 μm. Of course, other materials can be used for each lens, but at least one of them must be made of glass.

[0079] The maximum absolute value of the distortion within 0.7 of the field of view of the camera optical lens is defined as Dmax, which satisfies the following condition: Dmax≤2.00%.

[0080] Based on the above conditional expressions and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0081] The object-side surface of the first lens L1 is either convex or concave near the axis, while the image-side surface is concave near the axis. The object-side and image-side surfaces of the first lens L1 can also be configured with other concave or convex distributions.

[0082] The center radius of curvature of the object side of the first lens L1 is defined as R1, and the center radius of curvature of the image side of the first lens L1 is defined as R2, satisfying the following condition: 0.57≤(R1+R2) / (R1-R2)≤1.30. The shape of the first lens L1 is reasonably controlled so that the first lens L1 can effectively correct the spherical aberration of the system.

[0083] The on-axis thickness of the first lens L1 is d1, which satisfies the following condition: 0.08≤d1 / TTL≤0.15. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0084] The object-side surface of the second lens L2 is convex near the axis, and the image-side surface of the second lens L2 is concave near the axis. The object-side and image-side surfaces of the second lens L2 can also be configured with other concave and convex distributions.

[0085] The following condition must be met: 2.09≤f2 / f≤3.99. By controlling the positive optical power of the second lens L2 within a reasonable range, it is beneficial to correct the aberrations of the optical system.

[0086] The following condition, -7.23≤(R3+R4) / (R3-R4)≤-1.89, defines the shape of the second lens L2. Within this range, as lenses develop towards ultra-thin and wide-angle designs, it is beneficial for correcting on-axis chromatic aberration.

[0087] The on-axis thickness of the second lens L2 is defined as d3, which satisfies the following condition: 0.14≤d3 / TTL≤0.30. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0088] The object-side surface of the third lens L3 is either concave or convex near the axis, and the image-side surface of the third lens L3 is convex near the axis. The object-side and image-side surfaces of the third lens L3 can also be configured with other convex or concave distributions.

[0089] The following condition must be met: 3.56≤f3 / f≤5.39. Through the reasonable allocation of optical power, the system can achieve better imaging quality and lower sensitivity.

[0090] The central radius of curvature of the object side of the third lens L3 is defined as R5, and the central radius of curvature of the image side of the third lens L3 is defined as R6, satisfying the following condition: -0.18≤(R5+R6) / (R5-R6)≤1.04. This specifies the shape of the third lens L3, which is beneficial to the shaping of the third lens L3. Within the range specified by the condition, it can mitigate the degree of refraction of light passing through the lens and effectively reduce aberrations.

[0091] The on-axis thickness of the third lens L3 is defined as d5, which satisfies the following condition: 0.07≤d5 / TTL≤0.15. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0092] The object-side surface of the fourth lens L4 is convex near the axis, and the image-side surface of the fourth lens L4 is also convex near the axis. The object-side and image-side surfaces of the fourth lens L4 can also be configured with other convex / concave distributions.

[0093] The following condition must be met: 1.62≤f4 / f≤2.02. Through the reasonable allocation of optical power, the system can achieve better imaging quality and lower sensitivity.

[0094] The center radius of curvature of the object side of the fourth lens L4 is defined as R7, and the center radius of curvature of the image side of the fourth lens L4 is defined as R8, satisfying the following condition: -0.16≤(R7+R8) / (R7-R8)≤0.71. This specifies the shape of the fourth lens L4. When within this range, with the development of ultra-thin wide-angle lenses, it is beneficial to correct aberrations and other problems in off-axis drawing angles.

[0095] The on-axis thickness of the fourth lens L4 is defined as d7, which satisfies the following condition: 0.10≤d7 / TTL≤0.23. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0096] The camera optical lenses 10, 20, 30, 40, 50, 60, and 70 satisfy the following condition: 2.19 ≤ Fno ≤ 3.37, thereby achieving a large aperture and thus good imaging performance.

[0097] The camera optical lenses 10, 20, 30, 40, 50, 60, and 70 satisfy the following condition: 0.38 ≤ TTL ≤ 4.16.

[0098] Camera optical lenses 10, 20, 30, 40, 50, 60, and 70 have the technical effects of large field of view, large depth of field, and high-definition imaging; based on the characteristics of camera optical lenses 10, 20, 30, 40, 50, 60, and 70, camera optical lens 10 is particularly suitable for medical imaging equipment.

[0099] The camera optical lenses 10, 20, 30, 40, 50, 60, and 70 of the present invention will now be described using various embodiments. The symbols used in each embodiment are shown below. The units for focal length, on-axis distance, center radius of curvature, and on-axis thickness are mm.

[0100] TTL: Total optical length (axial distance from the object surface of the first lens L1 to the image plane Si), in mm;

[0101] Aperture value Fno: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens at apertures of 10, 20, 30, 40, 50, 60, and 70.

[0102] Image height IH of 1.0 field of view: The field of view height corresponding to the effective pixel of the sensor (i.e., half the diagonal length of the effective pixel area of ​​the sensor).

[0103] 1.0 Field of View (FOV): The field of view angle corresponding to the effective pixel of the sensor.

[0104] The technical solution of the present invention will be described in detail below with seven embodiments. The technical effects of the present invention cannot be achieved when the above-described conditions are not met.

[0105] (First Implementation)

[0106] The object-side surface of the first lens L1 is convex near the axis, while the object-side surface of the third lens L3 is concave near the axis.

[0107] Tables 1 and 2 show the design data of the camera optical lens 10 according to the first embodiment of the present invention.

[0108] Table 1

[0109] The meanings of the symbols in the table are as follows:

[0110] S1: Aperture;

[0111] R: Radius of central curvature at the center of the optical surface;

[0112] R1: The central radius of curvature of the object-side surface of the first lens L1;

[0113] R2: The central radius of curvature of the image-side surface of the first lens L1;

[0114] R3: The central radius of curvature of the object-side surface of the second lens L2;

[0115] R4: The central radius of curvature of the image-side surface of the second lens L2;

[0116] R5: The central radius of curvature of the object-side surface of the third lens L3;

[0117] R6: The central radius of curvature of the image-side surface of the third lens L3;

[0118] R7: The central radius of curvature of the object side surface of the fourth lens L4;

[0119] R8: The central radius of curvature of the image-side surface of the fourth lens L4;

[0120] R9: The center radius of curvature of the object side surface of the optical filter GF;

[0121] R10: Radius of curvature of the center of the image side of the optical filter GF;

[0122] d: Axial thickness of the lens, axial distance between lenses;

[0123] d0: The on-axis distance from aperture S1 to the object-side surface of the first lens L1;

[0124] d1: On-axis thickness of the first lens L1;

[0125] d2: The on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

[0126] d3: On-axis thickness of the second lens L2;

[0127] d4: The axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

[0128] d5: On-axis thickness of the third lens L3;

[0129] d6: The on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

[0130] d7: On-axis thickness of the fourth lens L4;

[0131] d8: The on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5;

[0132] d9: On-axis thickness of the optical filter GF;

[0133] d10: The on-axis distance from the image-side surface of the optical filter GF to the image plane Si;

[0134] nd: Refractive index of the d-line (the d-line represents green light with a wavelength of 550 nm);

[0135] nd1: The refractive index of the d-line of the first lens L1;

[0136] nd2: The refractive index of the d-line of the second lens L2;

[0137] nd3: The refractive index of the d-line of the third lens L3;

[0138] nd4: The refractive index of the d-line of the fourth lens L4;

[0139] ndg: The refractive index of the d-line of the optical filter GF;

[0140] vd: Abbe number;

[0141] v1: Abbe number of the first lens L1;

[0142] v2: Abbe number of the second lens L2;

[0143] v3: Abbe number of the third lens L3;

[0144] v4: Abbe number of the fourth lens L4;

[0145] vg: Abbe number of the optical filter GF.

[0146] Table 2 shows the aspherical data of each lens in the camera optical lens 10 of the first embodiment of the present invention.

[0147] Table 2

[0148] For convenience, the aspherical surfaces of each lens surface are those shown in formula (1) below. However, the present invention is not limited to the aspherical polynomial form represented by formula (1). z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 +A20r 20 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (1)

[0149] Where k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface at a distance r from the optical axis and a tangent plane at the vertex of the aspheric optical axis).

[0150] Figures 2 and 3 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 655nm, 610nm, 555nm, 510nm, 470nm, and 435nm passes through the imaging optical lens 10 of the first embodiment. Figure 4 shows schematic diagrams of field curvature and distortion after light with a wavelength of 555nm passes through the imaging optical lens 10 of the first embodiment. In Figure 4, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0151] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 0.197 mm, the image height IH of the 1.0 field of view of the camera optical lens 10 is 1.048 mm, the field of view FOV of the 1.0 field of view of the camera optical lens 10 is 139.66°, and the aperture value Fno of the camera optical lens 10 is 3.03. The camera optical lens 10 meets the design requirements of large field of view, large depth of field and high-definition imaging.

[0152] (Second Implementation)

[0153] The symbols in the second embodiment have the same meanings as those in the first embodiment.

[0154] Figure 5 shows the camera optical lens 20 of the second embodiment of the present invention.

[0155] Tables 3 and 4 show the design data of the camera optical lens 20 according to the second embodiment of the present invention.

[0156] Table 3

[0157] Table 4 shows the aspherical data of each lens in the camera optical lens 20 of the second embodiment of the present invention.

[0158] Table 4

[0159] Figures 6 and 7 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 655nm, 610nm, 555nm, 510nm, 470nm, and 435nm passes through the imaging optical lens 20 of the second embodiment. Figure 8 shows schematic diagrams of field curvature and distortion after light with a wavelength of 555nm passes through the imaging optical lens 20 of the second embodiment. In Figure 8, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0160] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 0.197 mm, the image height IH of the 1.0 field of view of the camera optical lens 20 is 1.048 mm, the field of view FOV of the 1.0 field of view of the camera optical lens 20 is 139.49°, and the aperture value Fno of the camera optical lens 20 is 3.04. The camera optical lens 20 meets the design requirements of large field of view, large depth of field and high-definition imaging.

[0161] (Third Implementation)

[0162] The symbols in the third embodiment have the same meanings as those in the first embodiment.

[0163] Unlike the first embodiment, the object-side surface of the first lens L1 is concave near the axis, while the object-side surface of the third lens L3 is convex near the axis.

[0164] Figure 9 shows the camera optical lens 30 of the third embodiment of the present invention.

[0165] Tables 5 and 6 show the design data of the camera optical lens 30 according to the third embodiment of the present invention.

[0166] Table 5

[0167] Table 6 shows the aspherical data of each lens in the camera optical lens 30 of the third embodiment of the present invention.

[0168] Table 6

[0169] Figures 10 and 11 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 655nm, 610nm, 555nm, 510nm, 470nm, and 435nm passes through the imaging optical lens 30 of the third embodiment. Figure 12 shows schematic diagrams of field curvature and distortion after light with a wavelength of 555nm passes through the imaging optical lens 30 of the third embodiment. In Figure 12, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0170] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 0.219 mm, the image height IH of the camera optical lens 30 in the 1.0 field of view is 1.048 mm, the field of view (FOV) of the camera optical lens 30 in the 1.0 field of view is 131.99°, and the aperture value Fno of the camera optical lens 30 is 3.03. The camera optical lens 30 meets the design requirements of large field of view, large depth of field, and high-definition imaging.

[0171] (Fourth Implementation)

[0172] The symbols in the fourth embodiment have the same meanings as those in the first embodiment.

[0173] Unlike the first embodiment, the object-side surface of the first lens L1 is concave near the axis, while the object-side surface of the third lens L3 is convex near the axis.

[0174] Figure 13 shows the camera optical lens 40 according to the fourth embodiment of the present invention. Tables 7 and 8 show the design data of the camera optical lens 40 according to the fourth embodiment of the present invention.

[0175] Table 7

[0176] Table 8 shows the aspherical data of each lens in the camera optical lens 40 of the fourth embodiment of the present invention.

[0177] Table 8

[0178] Figures 14 and 15 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm, and 435nm passes through the imaging optical lens 40 of the fourth embodiment. Figure 16 shows schematic diagrams of field curvature and distortion after light with a wavelength of 555nm passes through the imaging optical lens 40 of the fourth embodiment. In Figure 16, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0179] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 40 is 0.208 mm, the image height IH of the 1.0 field of view of the camera optical lens 40 is 1.048 mm, the field of view FOV of the 1.0 field of view of the camera optical lens 40 is 140.77°, and the aperture value Fno of the camera optical lens 40 is 3.00. The camera optical lens 40 meets the design requirements of large field of view, large depth of field, and high-definition imaging.

[0180] (Fifth Implementation)

[0181] The symbols in the fifth embodiment have the same meanings as those in the first embodiment.

[0182] Unlike the first embodiment, the object-side surface of the first lens L1 is concave near the axis, while the object-side surface of the third lens L3 is convex near the axis.

[0183] Figure 17 shows the camera optical lens 50 according to the fifth embodiment of the present invention. Tables 9 and 10 show the design data of the camera optical lens 50 according to the fifth embodiment of the present invention.

[0184] Table 9

[0185] Table 10 shows the aspherical data of each lens in the camera optical lens 50 of the fifth embodiment of the present invention.

[0186] Table 10

[0187] Figures 18 and 19 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm passes through the imaging optical lens 50 of the fifth embodiment. Figure 20 shows schematic diagrams of field curvature and distortion after light with a wavelength of 555 nm passes through the imaging optical lens 50 of the fifth embodiment. In Figure 20, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0188] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 50 is 0.224 mm, the image height IH of the camera optical lens 50 in the 1.0 field of view is 1.048 mm, the field of view (FOV) of the camera optical lens 50 in the 1.0 field of view is 123.93°, and the aperture value Fno of the camera optical lens 50 is 3.36. The camera optical lens 50 meets the design requirements of large field of view, large depth of field, and high-definition imaging.

[0189] (Sixth Implementation Method)

[0190] The symbols in the sixth embodiment have the same meanings as those in the first embodiment.

[0191] Unlike the first embodiment, the object-side surface of the first lens L1 is concave near the axis, while the object-side surface of the third lens L3 is convex near the axis.

[0192] Figure 21 shows the camera optical lens 60 according to the sixth embodiment of the present invention. Tables 11 and 12 show the design data of the camera optical lens 60 according to the sixth embodiment of the present invention.

[0193] Table 11

[0194] Table 12 shows the aspherical data of each lens in the camera optical lens 60 of the sixth embodiment of the present invention.

[0195] Table 12

[0196] Figures 22 and 23 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm passes through the camera optical lens 60 of the sixth embodiment. Figure 24 shows schematic diagrams of field curvature and distortion after light with a wavelength of 555 nm passes through the camera optical lens 60 of the sixth embodiment. In Figure 24, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0197] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 60 is 0.224 mm, the image height IH of the camera optical lens 60 in the 1.0 field of view is 1.048 mm, the field of view (FOV) of the camera optical lens 60 in the 1.0 field of view is 142.85°, and the aperture value (Fno) of the camera optical lens 60 is 2.19. The camera optical lens 60 meets the design requirements of large field of view, large depth of field, and high-definition imaging.

[0198] (Seventh Implementation)

[0199] The symbols in the seventh embodiment have the same meanings as those in the first embodiment.

[0200] Unlike the first embodiment, the object-side surface of the third lens L3 is convex near the axis.

[0201] Figure 25 shows the camera optical lens 70 according to the seventh embodiment of the present invention. Tables 13 and 14 show the design data of the camera optical lens 70 according to the seventh embodiment of the present invention.

[0202] Table 13

[0203] Table 14 shows the aspherical data of each lens in the camera optical lens 70 of the seventh embodiment of the present invention.

[0204] Table 14

[0205] Figures 26 and 27 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 655nm, 610nm, 555nm, 510nm, 470nm, and 435nm passes through the camera optical lens 70 of the seventh embodiment. Figure 28 shows schematic diagrams of field curvature and distortion after light with a wavelength of 555nm passes through the camera optical lens 70 of the seventh embodiment. In Figure 28, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0206] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 70 is 0.204 mm, the image height IH of the 1.0 field of view of the camera optical lens 70 is 1.048 mm, the field of view (FOV) of the 1.0 field of view of the camera optical lens 70 is 140.06°, and the aperture value Fno of the camera optical lens 70 is 3.03. The camera optical lens 70 meets the design requirements of large field of view, large depth of field, and high-definition imaging.

[0207] Table 15 shows the values ​​corresponding to the parameters specified in the conditional expressions for various numerical values ​​in each of the first, second, third, fourth, fifth, sixth, and seventh implementation methods.

[0208] Table 15

[0209] Those skilled in the art will understand that the above embodiments are specific implementations of the present invention, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A camera optical lens characterized in that, The camera optical lens comprises four lenses, and the four lenses are sequentially arranged from the object side to the image side as follows: a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, and a fourth lens with positive refractive power. Wherein, the focal length of the camera optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the field of view angle of 1.0 field of view of the camera optical lens is FOV, the aperture value of the camera optical lens is Fno, the edge thickness of the optical effective diameter of the first lens is ET1, the on-axis thickness of the first lens is d1, the central curvature radius of the object side surface of the second lens is R3, the central curvature radius of the image side surface of the second lens is R4, and the following conditions are satisfied: -1.40≤f1 / f≤-1.15; 35.00≤FOV / Fno≤66.00; 2.00≤ET1 / d1≤2.90; 1.70≤f3 / f4≤3.20; 0.60≤(R3+R4) / f2≤2.

40.

2. The camera optical lens according to claim 1, wherein, The total optical length of the camera optical lens is TTL, and the following condition is satisfied: 5.50≤TTL / f≤7.

00.

3. The camera optical lens according to claim 1, wherein, At least one of the first lens, the second lens, the third lens and the fourth lens is made of glass.

4. The camera optical lens according to claim 1, characterized in that, The maximum value of the absolute value of the distortion in the 0.7 field of view of the camera optical lens is Dmax, and the following condition is satisfied: Dmax≤2.00%.

5. The camera optical lens according to claim 1, wherein, The image side surface of the first lens is concave at the paraxial region; The total optical length of the camera optical lens is TTL, the central curvature radius of the object side surface of the first lens is R1, the central curvature radius of the image side surface of the first lens is R2, and the following conditions are satisfied: 0.57≤(R1+R2) / (R1-R2)≤1.3; 0.08≤d1 / TTL≤0.

15.

6. The camera optical lens according to claim 1, characterized in that, The object side surface of the second lens is convex at the paraxial region, and the image side surface of the second lens is concave at the paraxial region; The total optical length of the camera optical is TTL, the on-axis thickness of the second lens is d3, and the following condition is satisfied: 2.09≤f2 / f≤3.99; -7.23≤(R3+R4) / (R3-R4)≤- 1.89; 0.14≤d3 / TTL≤0.

30.

7. The camera optical lens according to claim 1, wherein, The image side surface of the third lens is convex at the paraxial region; The total optical length of the camera optical lens is TTL, and the following conditions are satisfied: 3.56≤f3 / f≤5.39; -0.18≤(R5+R6) / (R5-R6)≤1. 0.07≤d5 / TTL≤0.

15.

8. The camera optical lens according to claim 1, characterized in that, The object side surface of the fourth lens is convex at the paraxial region, and the image side surface of the fourth lens is convex at the paraxial region; An optical total track length of the camera optical lens is TTL, a center curvature radius of a fourth lens object side is R7, a center curvature radius of a fourth lens image side is R8, an on-axis thickness of the fourth lens is d7, and the following conditional expressions are satisfied: 1.62 ≤ f4 / f ≤ 2.02; -0.16 ≤ (R7+R8) / (R7-R8) ≤ 0.71; 0.10 ≤ d7 / TTL ≤ 0.

23.

9. The camera optical lens according to claim 1, characterized in that, The following conditional expression is satisfied: 2.19 ≤ Fno ≤ 3.37.

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